This book presents the concept of code and data propagation from the perspective of a group of autonomous and active beings such as agents. After the idea of propagation is fully explained it is brought to the world of a multi-agent system. Combining agent features and propagation algorithms results in real system examples, which could handle problems, where efficient communication between parts of a big structure is essential. The second part of this work focuses on an experimental system project. After the three ways of propagation in a multi-agent system are depicted and carefully...